Fix any_image_view::const_t

include/boost/gil/extension/dynamic_image/any_image_view.hpp

@@ -24,10 +24,10 @@ struct dynamic_xy_step_transposed_type;
 namespace detail {
 
 template <typename View>
-struct get_const_t { using type = typename View::const_t; };
+using get_const_t = typename View::const_t;
 
 template <typename Views>
-struct views_get_const_t : mp11::mp_transform<get_const_t, Views> {};
+using views_get_const_t = mp11::mp_transform<get_const_t, Views>;
 
 // works for both image_view and image
 struct any_type_get_num_channels

test/extension/dynamic_image/CMakeLists.txt

@@ -8,6 +8,7 @@
 message(STATUS "Boost.GIL: Configuring tests in test/extension/dynamic_image")
 foreach(_name
   any_image
+  any_image_view
   subimage_view)
   set(_test t_ext_dynamic_image_${_name})
   set(_target test_ext_dynamic_image_${_name})

test/extension/dynamic_image/any_image_view.cpp

@@ -0,0 +1,27 @@
+//
+// Copyright 2020 Samuel Debionne
+//
+// Distributed under the Boost Software License, Version 1.0
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+#include <type_traits>
+
+#include <boost/gil.hpp>
+#include <boost/gil/extension/dynamic_image/any_image_view.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+#include "test_fixture.hpp"
+#include "core/image/test_fixture.hpp"
+
+namespace gil = boost::gil;
+namespace fixture = boost::gil::test::fixture;
+
+int main()
+{
+    BOOST_TEST_TRAIT_SAME(gil::any_image_view<gil::gray8_view_t>::const_t, gil::any_image_view<gil::gray8c_view_t>);
+
+    return ::boost::report_errors();
+}